Samuel douglass



(No Model.)

S. DGUGLASS.

y PITMAN GOUPLING.

Patented Mar. l5, 1898.

No. 600,522A

k l L Inventor.

Attorney.

Witnesses.

PATENT Frrcn..

SAMUEL DOUGLASS, OF TEXAS, MICHIGAN.

PlTMAN-COUPLING.

SPECIFICATION forming' part Of Letters Patent N0. 600,522, dated March 15, 1898. Application led February 1, 189 7. Serial No. 621,577. (No modell) To a/ZZ whom it may concern:

Be it known that I, SAMUEL DoUGLAss, a citizen of the United States, residing in Texas, in the county of Kalamazoo and State of Michigan, have invented a certain new and useful Pitman-Coupling, of which the follow'- ing is a specification.

My invention relates to improvements in pitman connections, and more particularly to improvements in pitman connections for mowing-machines and harvesters.

The objects of myinvention are, first,to provide an improved pitman connection which shall not bind in any position which the various parts may assume from wear or other causes; second, to provide a pitman connection in which the joints may be kept tight; third, to provide apitman connection in which the joint can be perfectly tight and yet be free to play from side to side to prevent binding and unnecessary strain upon the crank or wrist pin; fourth, to provide an improved joint for such purposes in which the dust can be excluded; iifth, to provide an improved ball-bearing joint for such purposes, and, sixth, to provide an improved connection between the pitinan and the cutter-bar.

Further objects will appear definitely in the detailed description.

I accomplish these objects of my invention by the devices and means described in the following specification and illustrated in the accompanying drawings, in which Figure l is a side elevation, partly in section on a line corresponding to the line l l of Figs. 4t and 5, of the pitman crank-wheel 'the pitman and the wrist-pin.

andcutter-bar of a mowing-machine. Fig. 2 is a detailed View of the connection between Fig. 3 is an enlarged detail sectional elevation of the same, taken on line 3 3 of Fig. 2. Fig. 4: is an enlarged detail plan view of the connection between the pitman and the wrist-pin. Fig. 5 is an enlarged detail sectional view on line 5 5 of Fig. l of the connection between the pitman and cutter-bar.

In the drawings similar letters of reference refer to similar parts throughout the several views, and all of the section views are taken looking in the direction of the little arrows at the ends of the section-lines.

Referring to the lettered parts of the drawings, A is the crank-wheel of a mowing-machine.

B is the pitman, and D is the cutter-bar.

A is the wrist-pin, which is `secured to the crank-wheel A and on which there is a suitable flange I, that forms a cone of a ballbearing. On this is screwed a member A, which has on its inner end a flange I for a cone of a ball-bearing which comes opposite the flange I on the wrist-pin and forms between them a suitable ball-race for the balls F of the bearing.

The pitman-head B' is made spherical on the exterior, except at the sides and the point of attachment to the pitman. The opening in the head is also spherical, except where it opens at the sides and exactly iits over the balls F and retains them in the ball-race on the wrist-pin. The wrist-pin A and the 1nember AH have cup-shaped flanges a a', litted onto the exterior of the pitman-head and are cupped to fit the same to exclude sand and dust so far as possible. The opening through the head is larger than the wrist-pin to permit of a considerable play of the wrist-pin and pitman to prevent binding. The spherical opening of the head holds the joint tight.

The member A being adjustable retains the balls tight in the bearing and so takes up all play and lost motion no matter what p0- sition the pitman takes within the limits of its motion. The flange a. serves as a convenient means to handle the member A", and it is locked in position by a suitable nut.

On the cutter-bar D is an upwardly-projecting arm D, which takes the place of the usual eye 0r journal at that point. rlhis arm is curved in the arc of a true circle, the periphery of which is toward the end of the bar. The connection to the bar consists of the head C, which is recessed to extend each side of the arm D and contains a roller E on a pivot n therethrough. The roller ts the inside of the arm D. WVithin the head C is ablock C', adjustable therein. The outer side of the block is recessed to correspond to the outer surface of the arm D. Between the block C and the arm D are rollers E to reduce the friction. block C and arm D to retain the rollers E in The head is channeled out between IOO place. The block C' fits on a suitable journal and against a shoulder on the end of the pitman B.

The pitman B is secured to the heads B' and C by screw-threads, both of which are either right-handed or left-handed. By screwing the pitman into head C the block C' is adjusted and the bearing kept tight. This does not vary the length of the pitman, as it is screwed out of the head B' as fast as it is screwed into the head C, and vice versa.

Having thus described my improved pitman-conpling, I desire to state that it can be greatly varied in its details without departing from my invention.

I desire to state that the crank connection will be very effective without the flanges a d', and I am also aware that the cones can be adjusted and secured in other ways.

When the crank connection is used in such positions that the protection from dust and sand is not required and the fianges a d are dispensed with, the form of the exterior of the head is not material.

The roll E' in the connection to the cutterbar might be dispensed with, though it serves a useful purpose, and the number of rolls E is not material.

Other changes will readily suggest themselves to those skilled in the art to which my invention appertains.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is-

l.. In a pitman-coupling the combination of the crank-wheel A; the wrist-pin A',there on having the conical flange I; a member A", adjustable thereon having conical fiange I', opposite the fiangeI, 'a pitman-head B', having an opening therethrough for the wristpin that is spherical or globular on its inner surface; and bearing-balls F, retained between the conical flanges and the head as specified.

2. In a pitman-coupling the combination of a wrist-pin with a suitable ball-race therein; suitable bearing-balls in said race; a pitman-head having an opening larger than the wrist-pin to permit of play and spherical or globular on its inner surface to contact with the bearing-balls.

3. In a pitman-coupling the combination of the crank-wheel A, the wrist-pin A',thereon having the conical flanges I, and cupflanges a., thereon; a member A", adjustable thereon having conical flanges I', opposite the ange I, and cup-flange a'; a pitman-head B', spherical in form having an opening therethrough for the wrist-pin that is spherical on its inner surface; and bearing-balls F, retained between the conical anges and the head as specified.

4. In a pitman-coupling the combination of an inner vmember containing a ball-race; bearing-balls in said race; and an outer member having its inner surface spherical or globular in form to contact with said balls.

5. In a pitman-coupling the combination of an arm D', curved in an arc of a true circle; a pitman-head recessed to embrace the same; a pivot n, through said head with a roller E', thereon to engage said arm; ablock C', adjustable in said head and recessed out to correspond to the exterior of said arm D'; bearing-rollers E, between said block and arm; and the pitman B, with a screw connection to said head to adjust said block C', as specified.

6. In a pitman-coupling the combination of an arm D', curved in the arc of a true circle, a pitman-head recessed to embrace the same; a pivot n, between the head and said arm; a block C', adjustable in said head and recessed out to correspond to the exterior of the arm D'.; bearing-rollers E, between said blocks and arm; and the pitman B, with a screw connection in said head to adjust said block C', as specified.

In witness whereof I have hereunto set my hand and seal in the presence of two Witnesses.

SAMUEL DoUeLAss. [1.. Si

Witnesses:

W. S. Woon, V. E. CHAPPELL. 

